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Cadmium(Ⅱ) adsorption using functional mesoporous silica and activated carbon

机译：功能性介孔二氧化硅和活性炭吸附镉（Ⅱ）

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摘要

The role of surface functionality on silica and carbonaceous materials for adsorption of cadmium(Ⅱ) was examined using various mesoporous silica and activated carbon. Silica surfaces were principally functionalized by mono-amino- and mercapto-groups, while carboxylic group was introduced to the activated carbons by oxidation. Functional groups on silica surface were formed using grafting and co-condensation techniques in their preparation. Mono-amino group was found more effective than di-and tri-amino groups for cadmium(Ⅱ) adsorption on the grafted silica. Mono-amino groups prepared by co-condensation adsorbed cadmium(Ⅱ) as much as 0.25 mmol/g compared to mercapto- and carboxyl-groups which adsorbed around 0.12 mmol/g, whereas Langmuir adsorption affinities were as strong as 50-60 L/mmol for all of the three functions. The working pH range was wider for mercapto- and carboxyl-functions than for amino-group. Basic site could be an adsorption center for amino-functional groups while ion exchange sites were found to work for the mercapto- and carboxyl-functions to adsorb cadmium(Ⅱ) from aqueous phase. Based on the experimental results, surface functional groups rather than structure of silica and carbon seemed to play a decisive role for cadmium(Ⅱ) adsorption.
机译：利用各种介孔二氧化硅和活性炭，考察了表面官能度对二氧化硅和碳质材料吸附镉（Ⅱ）的作用。二氧化硅表面主要通过单氨基和巯基官能化，而羧基则通过氧化引入到活性炭中。在制备过程中，使用接枝和共缩合技术在二氧化硅表面形成官能团。发现单氨基比二氨基和三氨基对接枝二氧化硅上的镉（Ⅱ）吸附更有效。共聚制备的单氨基基团吸附镉（Ⅱ）的量高达0.25 mmol / g，而巯基和羧基基团的吸附量约为0.12 mmol / g，而Langmuir吸附亲和力高达50-60 L / g。所有三个功能的mmol数。巯基和羧基官能团的工作pH范围比氨基基团更宽。碱性位点可能是氨基官能团的吸附中心，而离子交换位点则起到了巯基和羧基官能团从水相吸附镉（Ⅱ）的作用。根据实验结果，表面官能团而不是二氧化硅和碳的结构似乎对镉（Ⅱ）的吸附起决定性作用。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.220-227|共8页
  • 作者

    Motoi Machida; Babak Fotoohi; Yoshimasa Amamo; Tomonori Ohba; Hirofumi Kanoh; Louis Mercier;

  • 作者单位

    Department of Chemistry and Biochemistry, Faulty of Science and Engineering, Laurentian University, Sudbury, Ontario P3E 2C6, Canada,Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Inage-ku, Chiba 263-8522, Japan,Safety and Health Organization, Chiba University, Inage-ku, Chiba 263-8522, Japan,Safety and Health Organization, Chiba University, Inage-ku, Chiba 263-8522, Japan;

    Department of Chemistry and Biochemistry, Faulty of Science and Engineering, Laurentian University, Sudbury, Ontario P3E 2C6, Canada;

    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Inage-ku, Chiba 263-8522, Japan,Safety and Health Organization, Chiba University, Inage-ku, Chiba 263-8522, Japan;

    Department of Chemistry, Graduate School of Science. Chiba University, Inage-ku. Chiba 263-8522, Japan;

    Department of Chemistry, Graduate School of Science. Chiba University, Inage-ku. Chiba 263-8522, Japan;

    Department of Chemistry and Biochemistry, Faulty of Science and Engineering, Laurentian University, Sudbury, Ontario P3E 2C6, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heavy metals; cadmium; mesoporous silica; activated carbon; adsorption;

    机译：重金属;镉;介孔二氧化硅活性炭;吸附;

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